require 'test/unit'
require 'shellwords'
require 'tmpdir'
require 'fileutils'
require 'open3'

class TestCommitEmail < Test::Unit::TestCase
  STDIN_DELIMITER = "---\n"

  def setup
    omit 'git command is not available' unless system('git', '--version', out: File::NULL, err: File::NULL)

    @ruby = Dir.mktmpdir
    Dir.chdir(@ruby) do
      git('init', '--initial-branch=master')
      git('config', 'user.name', 'Jóhän Grübél')
      git('config', 'user.email', 'johan@example.com')
      env = {
        'GIT_AUTHOR_DATE' => '2025-10-08T12:00:00Z',
        'GIT_CONFIG_GLOBAL' => @ruby + "/gitconfig",
        'TZ' => 'UTC',
      }
      git('commit', '--allow-empty', '-m', 'New repository initialized by cvs2svn.', env:)
      git('commit', '--allow-empty', '-m', 'Initial revision', env:)
      git('commit', '--allow-empty', '-m', 'version　1.0.0', env:)
    end

    @sendmail = File.join(Dir.mktmpdir, 'sendmail')
    File.write(@sendmail, <<~SENDMAIL, mode: "wx", perm: 0755)
      #!/bin/sh
      echo #{STDIN_DELIMITER.chomp.dump}
      exec cat
    SENDMAIL

    @commit_email = File.expand_path('../../tool/commit-email.rb', __dir__)
  end

  def teardown
    # Clean up temporary files if #setup was not omitted
    if @sendmail
      File.unlink(@sendmail)
      Dir.rmdir(File.dirname(@sendmail))
    end
    if @ruby
      FileUtils.rm_rf(@ruby)
    end
  end

  def test_sendmail_encoding
    omit 'the sendmail script does not work on windows' if windows?

    Dir.chdir(@ruby) do
      before_rev = git('rev-parse', 'HEAD^').chomp
      after_rev = git('rev-parse', 'HEAD').chomp
      short_rev = after_rev[0...10]

      out, _, status = EnvUtil.invoke_ruby([
        { 'SENDMAIL' => @sendmail, 'TZ' => 'UTC' }.merge!(gem_env),
        @commit_email, './', 'cvs-admin@ruby-lang.org',
        before_rev, after_rev, 'refs/heads/master',
        '--viewer-uri', 'https://github.com/ruby/ruby/commit/',
        '--error-to', 'cvs-admin@ruby-lang.org',
      ], '', true)
      stdin = out.b.split(STDIN_DELIMITER.b, 2).last.force_encoding('UTF-8')

      assert_true(status.success?)
      assert_equal(stdin, <<~EOS)
        Mime-Version: 1.0
        Content-Type: text/plain; charset=utf-8
        Content-Transfer-Encoding: quoted-printable
        From: =?UTF-8?B?SsOzaMOkbiBHcsO8YsOpbA==?= <noreply@ruby-lang.org>
        To: cvs-admin@ruby-lang.org
        Subject: #{short_rev} (master): =?UTF-8?B?dmVyc2lvbuOAgDEuMC4w?=
        J=C3=B3h=C3=A4n Gr=C3=BCb=C3=A9l\t2025-10-08 12:00:00 +0000 (Wed, 08 Oct 2=
        025)

          New Revision: #{short_rev}

          https://github.com/ruby/ruby/commit/#{short_rev}

          Log:
            version=E3=80=801.0.0=
      EOS
    end
  end

  private

  # Resurrect the gem environment preserved by tool/test/init.rb.
  # This should work as long as you have run `make up` or `make install`.
  def gem_env
    { 'GEM_PATH' => ENV['BUNDLED_GEM_PATH'], 'GEM_HOME' => ENV['BUNDLED_GEM_HOME'] }
  end

  def git(*cmd, env: {})
    out, status = Open3.capture2(env, 'git', *cmd)
    unless status.success?
      raise "git #{cmd.shelljoin}\n#{out}"
    end
    out
  end
end